THIS is the first of Mr. Morton's series of holiday talks, widening out from the British Isles to some of the more accessible holiday-haunts abroad. His first three talks will deal with England, Scotland, and Ireland, the present talk being devoted to the Cathedral Cities of England. The whole series is designed to help listeners in the perplexing and important annual question, Where shall we spend our holiday ? As the author of ' In Search of England,' and many other books attractively descriptive of the less known parts of the British Isles, Mr. Morton is an admirable guide.